I would recommend also Doubango. It supports G729 as you would like, and there’s an example project you can look into, which uses the framework – ImsDroid – there’s a lot of features already provided by ImsDroid and the source code is open.
You may take a look at siphon (http://code.google.com/p/siphon/). From their homepage: Home of the World’s first free SIP/VoIP application for iPhone and iPod Touch 1 and 2. Siphon SIP/VoIP project is the first in his category that works on iPhone and iPod Touch 2 with headset for all SIP providers. It is a native application … Read more
I went through a similar quest 7 years ago, but looking for an embedded C version. I looked at the oSIP library. It did all the work of converting SIP packets to structures and back. However, one point in the documentation stuck with me. The author recommended that you become very familiar with the SIP … Read more